The "CAD-Man" EXTEND Study

The CAD-Man (Coronary Artery Disease Management with Multislice Computed Tomography and Magnetic Resonance Imaging in Patients with Atypical Angina Pectoris) trial evaluated whether computed tomography (CT) or invasive coronary angiography (ICA) should be performed in patients clinically referred for coronary angiography with an intermediate probability of coronary artery disease. Patients with suspected CAD were randomized 1:1 ratio to CT, followed by ICA if positive for obstructive CAD, or to direct ICA. In both tests, obstructive CAD was defined as at least a 50% diameter stenosis in the left main coronary artery or at least a 70% diameter stenosis in other coronary arteries. Investigators and participants were blinded to randomization sequence but could not be blinded to the assigned group because of the apparent differences between CT and ICA. Independent investigators, who were blinded to the randomization group and were not part of the study team, anonymously assessed outcomes. Results on the comparative effectiveness of CT and ICA in preventing the primary outcome of major procedural complications within 48 hours of the last procedure and major adverse events (defined as cardiovascular death, nonfatal myocardial infarction, or nonfatal stroke) were published for a median follow-up of 3.3 years.

The primary results and additional subgroup analyses of the CAD-Man trial led to three new hypotheses that will be evaluated in the CAD-Man Extend study.

• Main hypothesis:

Whether CT-guided management of patients with atypical angina results in a reduction in coronary plaque burden (as determined by repeat CT scan) compared with direct-ICA management until 10 years.

• Secondary hypothesis:

• Whether clinical characteristics or blood levels and lipid-lowering medications have an impact on intraindividual progression of coronary plaques in patients in the CT group.

• Whether primary CT examination in patients with atypical angina leads to a reduction in chronic impairment of renal function after 10-years compared with initial ICA examination.

Inclusion criteria

• Patients with suspected CAD
• Patients with atypical angina
• Patients who have previously participated in the CAD-Man study and have not died at a median follow-up of 3.3 years.

Exclusion criteria

Exclusion criteria

for additional CT scan:

• Pregnancy
• Any health condition that would cause concern that participation would not be in the best interest of health (eg, extensive comorbidities)